31. The room is in a terrible mess; it _______ cleaned.
| A．can’t have been | B．shouldn’t have been |
| C．mustn’t have been | D．wouldn’t have been |
The people from the south enjoy the________in the north during the winter because they have never seen snow before.
| A．scenery | B．sightseeing | C．sight | D．view |
The hunter________that tiger，but luckily，it avoided________.
| A．shot；being shot at | B．shot at；being shot |
| C．shot；shooting | D．shot at；shot at |
The new teacher referred to________to our school yesterday.
| A．come | B．came | C．coming | D．comes |
As we all know，life is a long________full of happiness as well as hardships.
| A．journey | B．trip | C．travel | D．tour |
The disco music，digitally________in the studio，sounded fantastic at the party that night.
| A．recorded | B．recording |
| C．to be recorded | D．having recorded |